Projection image display device

A projection image display device comprising

• a light source:
• an image display panel having a number of pixels and a vertical scanning function;
• optical means having wave-length selectivity for dividing light from the light source into a plurality of lights of different wave ranges and directing each of the divided lights to a corresponding one of divisional areas of the image panel, said optical means comprising a hologram element having different diffraction angles for the different wave ranges,
• projection means for projecting an image displayed on the image display panel;
• and
• color-changing means for mutually changing, at every vertical scanning of the image display panel, the directions in which the optical means directs the plural lights of the different wave ranges, so as to mutually change the wave ranges of light directed to the divisional areas of the image display panel sequentially,
• wherein the image display panel displays an image with each of the divisional areas displaying a color of the wave range of light directed onto the divisional area at every change by the color-changing means, said color-changing means comprising a drive device for sequentially changing the diffraction angles of the hologram element synchronously with the vertical scanning of the image display panel.

A projection image display device comprising

• a light source;
• an image display panel having a number of pixels and a vertical scanning function;
• optical means for dividing light from the light source into a plurality of lights of different wave ranges and directing and overlapping the plural divided lights onto an area from different directions;
• light-collecting means for collecting each of the plural divided lights directed onto the area by the optical means into apertures of pixels of the image display panel corresponding to the wave range of the light;
• projection means for receiving lights modulated by the image display panel and projecting an image displayed on the image display panel;
• and
• color-changing means for moving the light-collecting means by pixel pitch at every vertical scanning of the image display panel so as to sequentially interchange the wave ranges of light directed to the pixels of the image display panel sequentially,
• wherein the image display panel displays an image with each of the pixels displaying a color of the wave range of light directed to the pixel at every change by the color-exchanging means.

A projection image display device comprising

• a light source;
• an image display panel having a number of pixels and a vertical scanning function;
• optical means for dividing light from the light source and directing and overlapping the divided plural luminous fluxes onto an area from different directions;
• color-collecting means for collecting each of the plural divided luminous fluxes of the different wave ranges into apertures of pixels of the image display panel corresponding to the wave range of the luminous flux;
• projection means for receiving lights modulated by the image display panel and projecting an image displayed on the image display panel;
• and
• color-changing means for sequentially interchanging the incident angles of the plural luminous fluxes of the different wave ranges to the image display panel so as to change the wave range of light directed to each pixel of the image display panel sequentially,
• wherein the image display panel displays an image with each of the pixels sequentially displaying a color of the wave range of light directed to the pixel at every change by the color-changing means.

A projection image display device comprising

• a light source;
• an image display panel having a number of pixels and a vertical scanning function;
• optical means having wave-length selectivity for dividing light from the light source into a plurality of lights of different wave ranges and directing each of the divided lights to a corresponding one of divisional areas of the image display panel, said optical means comprising a plurality of dielectric mirrors corresponding to the plural divided lights;
• projection means for projecting an image displayed on the image display panel;
• and
• color-changing means for mutually changing, at every vertical scanning of the image display means panel, the directions in which the optical means directs the plural lights of the different wave ranges, so as to mutually change the wave ranges of light directed to the display panel sequentially,
• wherein the image display panel displays an image with each of the divisional areas displaying a color of the wave range of light directed onto the divisional area at every change by the color-changing means;
• said color-changing means comprising a drive device for sequentially changing the corresponding wave ranges of the plural dielectric mirrors synchronously with the vertical scanning of the image display panel.

The projection image display device according to claim 25, wherein

• the image display panel comprises a liquid crystal panel;
• the optical means comprises three dichroic mirrors for dividing the light from the light source into three primary colors of red, green and blue and directing each of the red, green and blue lights to a corresponding one of three divisional areas of the liquid crystal display panel;
• and
• the color-changing means comprises a drive device for operating each of the three dichroic mirrors synchronously with the vertical scanning of the liquid crystal so as to change the color of light directed onto each divisional area of the liquid crystal display panel to red, green or blue sequentially.